Tutorial by Examples: p

Lambda - Listener Example

Anonymous class listener Before Java 8, it’s very common that an anonymous class is used to handle click event of a JButton, as shown in the following code. This example shows how to implement an anonymous listener within the scope of btn.addActionListener. JButton btn = new JButton("My Butto...

Line plots

Simple line plot import matplotlib.pyplot as plt # Data x = [14,23,23,25,34,43,55,56,63,64,65,67,76,82,85,87,87,95] y = [34,45,34,23,43,76,26,18,24,74,23,56,23,23,34,56,32,23] # Create the plot plt.plot(x, y, 'r-') # r- is a style code meaning red solid line # Show the plot plt.show...

Hello Web (Basic "Hello World"-type setup)

<html> <head> <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <script src="https:...

Reading the response

response = requests.get("https://api.github.com/events") text_resp = response.text JSON response: for json-formatted responses the package provides a built-in decoder response = requests.get('https://api.github.com/events') json_resp = response.json() This method will raise a Valu...

Show month and year dropdown

jQuery datepicker has two options to allow displaying dropdowns for month and year selection. These options make navigation through large timeframes easier. <input type="text" id="datepicker"> <script> $("#datepicker").datepicker({ changeMont...

Installation or Setup

We have 2 way, we can install Universal app in windows 10 devices (OS/Phone). One app works for both mobile and OS 1 Install using Power Shell command Step 1: Make sure app not have any error and developed, then right click on Universal app project in solution explorer. Step 2: Select Store and C...

Deferring operations using $q.defer

We can use $q to defer operations to the future while having a pending promise object at the present, by using $q.defer we create a promise that will either resolve or reject in the future. This method is not equivalent of using the $q constructor, as we use $q.defer to promisify an existing routin...

CSS3 :in-range selector example

<style> input:in-range { border: 1px solid blue; } </style> <input type="number" min="10" max="20" value="15"> <p>The border for this value will be blue</p> The :in-range CSS pseudo-class matches when an element...

Even more specific loop targeting

Let's say we want to change main loop, only for specific taxonomy, or post type. Targeting only main loop on book post type archive page. add_action( 'pre_get_posts', 'my_callback_function' ); function my_callback_function( $query ) { if( !$query->is_main_query() || is_admin() ) return;...

Show posts from only one category

add_action( 'pre_get_posts', 'single_category' ); function single_category( $query ) { if( !$query->is_main_query() || is_admin() ) return; $query->set( 'cat', '1' ); return; }

Pre get posts filter basic usage

Sometimes you would like to change main WordPress query. Filter pre_get_posts is the way to go. For example using pre_get_posts you can tell main loop to show only 5 posts. Or to show posts only from one category, or excluding any category etc. add_action( 'pre_get_posts', 'my_callback_function' ...

Exclude category from posts list edit share

add_action( 'pre_get_posts', 'single_category_exclude' ); function single_category_exclude( $query ) { if( !$query->is_main_query() || is_admin() ) return; $query->set( 'cat', '-1' ); return; }

Change posts_per_page for main loop

All we need to do is to use set() method of $query object. It takes two arguments, first what we want to set and second what value to set. add_action( 'pre_get_posts', 'change_posts_per_page' ); function change_posts_per_page( $query ) { if( !$query->is_main_query() || is_admin() ) retu...

Checking if an Email Address appears in a list of addresses

Let's say you need to check if an email address appears in a long list of email addresses. Use the MATCH function to return the row number on which the email address can be found. If there is no match, the function returns an #N/A error. =MATCH(F2,$D$2:$D$200,0) The value you're retrieving ...

Upcasting

The as operator will cast to a supertype. As it cannot fail, it does not return an optional. let name = "Ringo" let value = string as Any // `value` is of type `Any` now

Query from XML Data Type

DECLARE @xmlIN XML = '<TableData> <aaa Main="First"> <row name="a" value="1" /> <row name="b" value="2" /> <row name="c" value="3" /> </aaa> <aaa Main="Second"> &l...
SQL • XML

Plotting The Regression (base)

Continuing on the mtcars example, here is a simple way to produce a plot of your linear regression that is potentially suitable for publication. First fit the linear model and fit <- lm(mpg ~ wt, data = mtcars) Then plot the two variables of interest and add the regression line within the d...

Adding a new option

ALTER TABLE tbl MODIFY COLUMN type ENUM('fish','mammal','bird','insect'); Notes As with all cases of MODIFY COLUMN, you must include NOT NULL, and any other qualifiers that originally existed, else they will be lost. If you add to the end of the list and the list is under 256 items, the ALTER...
MySQL • ENUM

Spawning Threads with `forkIO`

Haskell supports many forms of concurrency and the most obvious being forking a thread using forkIO. The function forkIO :: IO () -> IO ThreadId takes an IO action and returns its ThreadId, meanwhile the action will be run in the background. We can demonstrate this quite succinctly using ghci: ...

Identify TempDb usage

Following query will provide information about TempDb usage. Analyzing the counts you can identify which thing is impacting TempDb SELECT SUM (user_object_reserved_page_count)*8 as usr_obj_kb, SUM (internal_object_reserved_page_count)*8 as internal_obj_kb, SUM (version_store_reserved_page_cou...

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